Kingston offers PC2-6400 CAS Latency 4 memory in their standard series and in an NVIDIA "SLI Ready" line that features Enhanced Performance Profiles (EPP). Total kit capacity is 2GB (2048MB) which is ideal for high performance platforms. Each module pair has been tested to run at DDR2 800MHz at low latency timing of 4-4-4-12 at 2.0V. The SPD is programmed to JEDEC standard latency 800Mhz timing of 5-5-5-15-2T at 1.9V so you are sure that the system will post every time...